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Subsequent Events (Details) (Subsequent Event, USD $) In Millions, unless otherwise specified	0 Months Ended
	Nov. 05, 2014
BridgeTex Pipeline Company LLC | Magellan Midstream Partners L.P.
Subsequent events
Ownership interest held (as a percent)	50.00%
Pending Acquisition | PAA | Definitive purchase and sale agreement | Oxy
Subsequent events
Term of lock-up arrangement	15 months
Period for which certain owners have agreed to refrain from the sale of their ownership interests	90 days
Pending Acquisition | PAA | Definitive purchase and sale agreement | Oxy | BridgeTex Pipeline Company LLC
Subsequent events
Ownership interest to be acquired (as a percent)	50.00%
Purchase price of business to be acquired	$ 1,075
Capacity of crude oil pipeline	300,000

X

- Definition

Represents the capacity of the crude oil pipeline.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period for which certain owners have agreed to refrain from the sale of their ownership interests.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
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X

- Definition

Represents the term of lock-up arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	pagp_
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Period Type:	duration

X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Details

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